Examine source code of Simple Programming Assist

{
  "manifest_version": 2,
  "name": "Simple Programming Assist",
  "description": "Backward the cursor position one character, if Continuously typed open and close of parentheses, brackets and curly brackets.",
  "version": "1.1resigned1",
  "author": "backy0175",
  "content_scripts": [
    {
      "js": [
        "script.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "applications": {
    "gecko": {
      "id": "@simple-programming-assist"
    }
  }
}